Usually , emdemd , I do my Roth conversions in the fall of every calendar year in the September / October time frame for the reasons John explained about custodians sometimes dropping the ball . Once it took Schwab over six weeks to transact my Roth conversion . ?

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This last tax year of 2006 , I did my conversion in January , but I will do my conversion for 2007 later this fall again once I'm more sure how my other income , personally owned real estate sales , will fare . Don't want to go over the income limit for conversions .
Starting in 2008 , we're supposed to be able to do Roth conversions straight from 401(k)s and I'm really looking forward to that rule regulation change . Don't worry about missing 2006 . You can be early for this tax year of 2007 and enjoy more taxfree earnings forever .